Driveway Deposits

[MondeoMan1981]

Got this light coloured patches on some of my driveway monoblocks.

Any thoughts on if it's mould, dried in AdBlue or something else?

I have an ID.7 that's usually parked there, but the Mrs' A180d had been parked there a few times recently - but we don't have this on the other side of the driveway and it's on different parts of the drive so if AdBlue it's like the leak would be coming from different places....

[DavePanda]

Salt deposits coming out the brick

[cRaigAl205]

It looks like efflorescence to me. If the blocks are relatively new, it will be a regular occurance for a while. Its the salt moving to the surface due to the moisture transiting/evaporating from the ground.

https://www.allbrickandstone.com/brick-and-stone-a...

It will be weathered/eroded over time, or you can assist with manual scrubbing, jet-washing (risks introducing a load more water..) or a specialist cleaner (patio cleaner/brick acid etc.)

https://www.amazon.co.uk/SIKA-Brick-Patio-Cleaner-...

[John D.]

It's efflorescence / salts coming out the brick.

[MondeoMan1981]

Ah I never considered brick salts! Driveway is 2 years old, house is a new build.

Ironically I've just cleaned the patio and path for this year, not got around to the driveway - it's never been cleaned - so its on my list - thanks everyone!